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there is also the whole balance thing. Stand there and just bring your leg straight out with your hands up by your face. Now do it and put an arm out for balance. Much easier. That is why most people will get alot more power when they throw an arm down. It helps their balance.
i think your picturing the hands up scenerio wrong.. they dont stay stagnant in place.. your actually switching your guard, which in turn switches your shoulders and adds the extra torque in the upper reason.. also the guard is out, it doesnt come up to the face.. the only difference in this variation is that the arm isn't thrown completly back to the body, but it does actually move.